a form of noise, or 'erroneous' signal or data which is intentionally added to sample data to minimize undesirable effects in digital signal processing, where a continuous range of values (or a very large set of possible discrete values) is approximated by a relatively small set of discrete symbols or integer values.
The method used in digital systems to smooth out the transitions from one bit to another at low levels. Dither makes a digital recording sound and behave more like analog. The better a recording is dithered, the higher its apparent resolution.
The technique of adding controlled amounts of noise to a signal to improve overall system loop control, or to smear quantizing error in an A/D converter application.